It's amazing how quick you would pick it up mate , the human brain is the human brain . You've just never really really tried.In one generation it has gone from my dad, who could turn his hand to anything, to me who is utterly useless at anything that would help out in adversity.
A good call. Not sure it would destroy humanity but could destroy civilisation.Geomagnetic storm. The last big one hit us in 1859 (The Carrington Event) and wiped out the telegraph system. A similar one today of the same magnitude would probably cause our electricity system and supply to be severely damaged for years if not decades.